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. 2018 Mar 6;8(3):e017883. doi: 10.1136/bmjopen-2017-017883

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Network of eligible comparisons for treatment efficacy network meta-analysis for Kashin-Beck disease. The width of lines is proportional to the number of studies compared in every pair of treatments, and the size of nodes is proportional to the total sample size of each treatment. Two-arm study, n=11; three-arm study, n=3 (Cui 1984,²⁵ Guo 1986,²⁸ Chen 2003³⁵); four-arm study, n=1 (Zhou 1991³¹) Se, sodium selenite; Se salt, selenium salt; Se+VC, the combination of sodium selenite with vitamin C; Se+VE, the combination of sodium selenite with vitamin E; SE yeast, selenium enriched yeast; VC, vitamin C.